Drivers who have been following detours for two-and-a-half months will be able to return to their old routes after state officials said yesterday that the Callahan Tunnel is expected to reopen Monday, two days ahead of schedule.

The tunnel, which connects downtown to East Boston and Logan International Airport, has been closed since Dec. 27 for repairs and is set to open Monday at 5 a.m., in time for the morning commute, according to MassDOT officials.

Drivers had been detoured since the closure, and for the most part feared traffic jams did not materialize.

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